[Farmall] Water (or something) in gasoline

[Tim Savelle]

I've got a 1949 H.  I'm having a perpetual problem with what appears to be
water in my gas.  I've tried keeping the gas tank full at all times, and
also tried Stabil.  Nothing seems to help.  After about 3 or 4 weeks
following a fresh tank of gas I notice a water layer collecting at the
bottom of the fuel bowl after I start it.  Twice I've had to drain the
entire gas tank and dispose of the gas.  Here in my part of Georgia all the
gasoline is 10% ethanol.  Could this be an ethanol-related issue?  I can't
imagine that much condensation inside the tank when I keep the gas tank full
to the top.  It just seems like the gasoline "goes bad".  Is that possible?
Anyone got any insight or suggestions?  Thanks, Tim